How “unknown hackers” hack half the Internet at a time

Despite the fact that the topic of personal security on the network is already pretty much fed up with everyone, people continue to attack the same rake. Many still hide all their money and secrets behind banal passwords like "123".

Habro-survey on the topic here .
')
The theme is inspired by my personal statistics of “picking” several well-known Internet resources.
And according to it, almost 40% of users use one password for everything.

---

Due to the fact that most of the services are written hastily, the bases of users of these resources fell into my hands more than once. And the latter is particularly pleased - 35,000 not hashed entries. All passwords were stored in clear form.

But not even the client accounts of such resources are interesting, but the fact that almost half of the users have a password for the site coming to their mailbox specified in the database.

I only considered statistics on users of GMail, Yahoo and Hotmail, since Writing scripts to check each new specific mail-service would take half a life.

Specifically on the last occasion:
Users in the database -> 34731;
Hotmail -> 10874; Matches -> 4348; 40%
GMail -> 10143; Matches -> 3245; 32%
Yahoo -> 7259; Matches -> 3266; 45%

According to personal observations and feedback from people who studied these databases in 9 out of 10 users, the password to the mail was repeated on all other resources, up to and including payment systems.
This is despite the fact that mail is the key to everything a user has, his e-life, personal correspondence, and password recovery. And many simply do not understand this .

Maybe you should think?

The names of electronic services are not called for obvious reasons.